docs: def set_locale(self, lang):
          """ Sets 'locale' parameter to specify the language \
          of the query you are sending (only ja is currently effective)
  
          :param lang: A 2-letter language code string (ISO 6391 compatible)
          :raises: TwitterSearchException
          """
  
          if lang in self.iso_6391:
              self.arguments.update({'locale': '%s' % lang})
          else:
              raise TwitterSearchException(1002)